Cosmetic brush



FIG. 1 is a perspective front view of a cosmetic brush, embodying the new design;

FIG. 2 is a top view of the design shown in FIG. 1;

FIG. 3 is a bottom view of the design shown in FIG. 1;

FIG. 4 is a left side view of the design shown in FIG. 1;

FIG. 5 is a right side view of the design shown in FIG. 1;

FIG. 6 is a front view of the design shown in FIG. 1; and,

FIG. 7 is a back view of the design shown in FIG. 1.

The broken lines shown in the drawings illustrate the environment and form no part of the claimed design. 

We claim the ornamental design for a cosmetic brush, as shown and described. 